MATLAB: Enumerated Data Type in MATLAB

enumerated data typeenumeration

I want to define a enumerated data type (eMatType) which consists of the following definitions :
STEEL = 1
CONCRETE = 2
ALUMINUM = 3
Now, once that data type is created, how can I use it to declare a variable. eg. if I want to delclare a variable as 'double', I use x = zeros(1,1,'double')
How can I declare a variable with the new enumerated data type?
Thanks.
Related Question